Residual current operated circuit breaker

Abstract

This utility model belongs to the field of low-voltage electrical technology and discloses a residual current operated circuit breaker. The residual current operated circuit breaker includes a button mounted on a mounting housing and a test device disposed within the mounting housing. The test device includes a first torsion spring, a second torsion spring, a resistor, and a wire: the first end of the first torsion spring abuts against a first terminal block, and the second end abuts against the button; the fourth end of the second torsion spring abuts against a rocker arm of an operating mechanism; pressing the button causes the second end to abut against the third end; when the operating mechanism is in the closed state, the rocker arm causes the fourth end to abut against the first pin of the resistor; one end of the wire is connected to the second pin of the resistor, and the other end of the wire passes through a zero-sequence current transformer and connects to a second terminal block. This utility model can simulate residual current, facilitating testing whether the residual current operated circuit breaker can operate, and helps to periodically check whether the residual current protection function is intact.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to residual current operated circuit breakers. Background Technology

[0002] Residual current operated circuit breakers are important electrical safety protection devices, mainly used to quickly cut off the power supply when leakage occurs in the circuit or when a person is electrocuted, thereby preventing electric shock accidents and electrical fires.

[0003] In existing technologies, residual current circuit breakers are equipped with testing devices to simulate the occurrence of residual current, facilitating periodic testing of the residual current protection function. However, some existing testing devices typically have single-break test circuits, making the tests unreliable; others have double-break test circuits, which are usually structurally complex. Utility Model Content

[0004] The purpose of this invention is to provide a residual current operated circuit breaker that is not only reliable in testing but also simple in structure. It can simulate residual current, making it easy to test whether the residual current operated circuit breaker can operate and helping to periodically check whether the residual current protection function is intact.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A residual current operated circuit breaker includes a mounting housing, an operating mechanism, and a zero-sequence current transformer. The mounting housing is provided with a first terminal block and a second terminal block. The operating mechanism and the zero-sequence current transformer are both disposed within the mounting housing. The circuit breaker also includes a button disposed on the mounting housing and a testing device disposed within the mounting housing. The testing device includes:

[0007] A first torsion spring has a first end and a second end, the first end abutting against the first terminal block, and the second end abutting against the button;

[0008] The second torsion spring has a third end and a fourth end, the fourth end abutting against the rocker arm of the operating mechanism, and pressing the button can cause the second end to abut against the third end;

[0009] The resistor has a first pin and a second pin. When the operating mechanism is in the closed state, the rocker arm can drive the fourth end to abut against the first pin.

[0010] A wire, one end of which is connected to the second pin, and the other end of which passes through the zero-sequence transformer and is connected to the second terminal block.

[0011] As an alternative to the residual current operated circuit breaker, the operating mechanism has a first positioning post on its outer casing sidewall, and the first helical portion of the first torsion spring is sleeved on the first positioning post; and / or

[0012] The operating mechanism has a second positioning post on its outer shell side wall, and the second helical part of the second torsion spring is sleeved on the second positioning post.

[0013] As an alternative to the residual current operated circuit breaker, the first end is provided with a first bent overlapping section, and the first terminal block is provided with a first slot, wherein the first bent overlapping section is engaged with the first slot.

[0014] As an alternative to the residual current operated circuit breaker, the lower end of the button is provided with a plurality of second slots, and the second end engages with one of the second slots.

[0015] As an alternative residual current operated circuit breaker, the second end is provided with a second bent overlapping section, and the third end is provided with a third bent overlapping section. Pressing the button can cause the second bent overlapping section to abut against the third bent overlapping section.

[0016] As an alternative to the residual current operated circuit breaker, the lower end of the rocker arm is provided with a third slot, and the fourth end engages with the third slot; and / or

[0017] The fourth end is provided with a fourth bent overlapping section. When the operating mechanism is in the closed state, the rocker arm can drive the fourth bent overlapping section to abut against the first pin.

[0018] As an alternative to the residual current operated circuit breaker, the mounting housing includes a housing cover and a housing base that interlock with each other. The housing cover and the housing base form a receiving cavity. The operating mechanism and the testing device are both located in the receiving cavity. The housing cover is provided with a through hole, and the button is located in the through hole.

[0019] As an optional residual current operated circuit breaker, the lower end of the button is provided with a barb, which stops against the bottom wall of the housing cover.

[0020] As an alternative to the residual current operated circuit breaker, the housing base is provided with at least two first mounting slots, and the first terminal block and the second terminal block are respectively installed in the two first mounting slots.

[0021] As an optional residual current operated circuit breaker, the housing base is provided with a second assembly slot and a pin slot, the resistor is inserted into the second assembly slot, and the first pin of the resistor is engaged with the pin slot.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] The residual current operated circuit breaker provided by this utility model has a first end of a first torsion spring in direct contact with a first terminal block. This direct contact not only ensures a good electrical connection but also simplifies the circuit structure. The second end of the first torsion spring contacts a button on the mounting housing. The second end of the first torsion spring and the third end of the second torsion spring form the first break point of the test circuit. The fourth end of the second torsion spring contacts the rocker arm of the operating mechanism. The fourth end of the second torsion spring and the first pin of the resistor form the second break point of the test circuit. The resistor is connected to the second terminal block via a wire. By pressing the button on the mounting housing, the button causes the second end of the first torsion spring to contact the third end of the second torsion spring, switching the operating mechanism to the closed state. This causes the rocker arm to cause the fourth end of the second torsion spring to contact the first pin of the resistor, connecting the first and second breaks in the test circuit, completing the current loop. A zero-sequence sensor detects whether there is residual current in the wire. When the first and second terminal blocks are connected to the two poles of the power supply, pressing the button and switching the operating mechanism to the closed state can simulate residual current, facilitating testing of whether the residual current operated circuit breaker can operate and helping to periodically check whether the residual current protection function is intact. The test circuit of the residual current operated circuit breaker has two breakpoints. The first and second breakpoints are controlled by the button and the operating mechanism respectively, ensuring high reliability and preventing the user from burning out the resistors in the test circuit due to prolonged button pressing. Attached Figure Description

[0024] Figure 1 This is an exploded schematic diagram of the residual current operated circuit breaker in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the test circuit in an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the button structure in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the first torsion spring in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the second torsion spring in an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the operating mechanism in an embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the first terminal block in an embodiment of this utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the housing base in an embodiment of this utility model.

[0032] In the picture:

[0033] 100. Mounting housing; 101. Housing cover; 1011. Through hole; 102. Housing base; 1021. First assembly slot; 1022. Second assembly slot; 1023. Pin slot; 200. Operating mechanism; 201. Rocker arm; 2011. Third slot; 202. Housing; 2021. First positioning post; 2022. Second positioning post; 300. Zero-sequence current transformer;

[0034] 1. Button; 2. First torsion spring; 3. Second torsion spring; 4. Resistor; 5. Wire; 6. First terminal block; 61. First slot; 7. Second terminal block;

[0035] 11. Second slot; 12. Barbed part;

[0036] 21. First end; 211. First bent lap joint; 22. Second end; 221. Second bent lap joint; 23. First spiral portion;

[0037] 31. Third end; 311. Third bent lap joint; 32. Fourth end; 321. Fourth bent lap joint; 33. Second spiral section;

[0038] 41. First pin; 42. Second pin. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] To simulate residual current, facilitate testing the operation of residual current circuit breakers, and help periodically check the functionality of residual current protection, this embodiment provides a residual current circuit breaker. The following describes a residual current circuit breaker in conjunction with... Figures 1 to 8 The specific content of this embodiment will be described in detail.

[0044] like Figures 1 to 5As shown, the residual current operated circuit breaker provided in this embodiment includes a mounting housing 100, an operating mechanism 200, a zero-sequence current transformer 300, a push button 1, and a testing device. The mounting housing 100 serves as the supporting frame for the entire device, providing a stable installation environment for the internal components. The mounting housing 100 also includes a first terminal block 6 and a second terminal block 7. These two terminal blocks play a crucial role in circuit connection, reliably connecting to the positive and negative poles of the external power supply to ensure smooth current flow into and out of the circuit breaker. The operating mechanism 200 and the zero-sequence current transformer 300 are both housed within the mounting housing 100. The operating mechanism 200 is the core actuator for the circuit breaker's switching function; it precisely controls the circuit's on / off state, ensuring stable power supply to the load under normal operating conditions and rapidly disconnecting the circuit in case of abnormalities, thus ensuring electrical safety. The zero-sequence current transformer 300 is a key component for residual current detection. It constantly monitors current changes in the circuit, and once the residual current exceeds a set value, it promptly sends a signal, triggering the circuit breaker's protective action. The residual current operated circuit breaker has a button 1 mounted on the mounting housing 100, and a test device is configured inside the mounting housing 100. The test device includes key components such as a first torsion spring 2, a second torsion spring 3, a resistor 4, and wires 5. The first torsion spring 2 has a first end 21 and a second end 22. The first end 21 directly abuts against the first terminal block 6. This direct abutting method not only ensures a good electrical connection but also simplifies the circuit structure. The second end 22 abuts against the button 1, and when the button 1 is pressed by external force, it can directly act on the second end 22 of the first torsion spring 2. The second torsion spring 3 also has specific third ends 31 and fourth ends 32. The fourth end 32 abuts against the rocker arm 201 of the operating mechanism 200. The rocker arm 201, as an important component of the operating mechanism 200, plays a crucial transmission role in the closing and opening processes of the circuit breaker. The abutting between the fourth end 32 of the second torsion spring 3 and the rocker arm 201 allows the second torsion spring 3 to move accordingly with the movement of the rocker arm 201. When button 1 is pressed, the second end 22 of the first torsion spring 2 abuts against the third end 31 of the second torsion spring 3. This seemingly simple action lays the foundation for the conduction of the test circuit. Resistor 4, as a key component in the test device, has a first pin 41 and a second pin 42. When the operating mechanism 200 is in the closed state, the rocker arm 201 drives the fourth end 32 of the second torsion spring 3 to abut against the first pin 41 of the resistor 4. This design allows resistor 4 to be connected to the test circuit under specific conditions, thereby changing the current characteristics in the circuit and simulating the residual current situation. One end of the wire 5 is connected to the second pin 42 of the resistor 4, and the other end of the wire 5 passes through the zero-sequence current transformer 300 and connects to the second terminal block 7. The wire 5 passing through the zero-sequence current transformer 300 allows the zero-sequence current transformer 300 to monitor the current in the wire 5 in real time, providing the necessary conditions for the detection of residual current.

[0045] The residual current operated circuit breaker provided by this utility model has a first end 21 of the first torsion spring 2 in contact with the first terminal block 6, ensuring a reliable connection to one pole of the power supply. The second end 22 of the first torsion spring 2 is in contact with the button 1 on the mounting housing 100, allowing the button 1 to participate in the on / off control of the test circuit by controlling the second end 22 of the first torsion spring 2. The second end 22 of the first torsion spring 2 and the third end 31 of the second torsion spring 3 form the first break point of the test circuit. The existence of this break point means that the test circuit is initially in an open state and will only be connected when the button 1 is pressed. The fourth end 32 of the second torsion spring 3 is in contact with the rocker arm 201 of the operating mechanism 200, and the movement state of the rocker arm 201 can affect the position of the fourth end 32 of the second torsion spring 3. The fourth end 32 of the second torsion spring 3 and the first pin 41 of the resistor 4 form the second break point of the test circuit. When the operating mechanism 200 is in the closed state, the rocker arm 201 drives the fourth end 32 of the second torsion spring 3 to contact the first pin 41 of the resistor 4, and the second break point is connected. Resistor 4 is connected to the second terminal block 7 via wire 5, thus forming a complete test circuit.

[0046] In practical applications, pressing button 1 on the mounting housing 100 triggers a series of chain reactions. Button 1 causes the second end 22 of the first torsion spring 2 to contact the third end 31 of the second torsion spring 3, thus closing the first break point in the test circuit. Simultaneously, switching the operating mechanism 200 to the closed state causes the rocker arm 201 to cause the fourth end 32 of the second torsion spring 3 to contact the first pin 41 of the resistor 4, closing the second break point as well. At this point, both the first and second breaks in the test circuit are connected, forming a complete current loop. The zero-sequence current transformer 300 monitors the current in the conductor 5 in real time to detect the presence of residual current.

[0047] When the first terminal block 6 and the second terminal block 7 are connected to the two poles of the power supply, and button 1 is pressed and the operating mechanism 200 is switched to the closed state, this series of operations can accurately simulate the residual current situation. This simulation function is crucial for testing whether the residual current circuit breaker can operate normally. In actual use, the residual current protection function of electrical equipment needs to be tested regularly to ensure that it can reliably function at critical moments. Through the circuit breaker's testing function, staff can conveniently and quickly test the residual current protection function without relying on complex external equipment or performing cumbersome operations. Simply press button 1 and switch the operating mechanism 200 to the closed state to observe whether the circuit breaker can operate in a timely manner and cut off the circuit. This helps to regularly check whether the residual current protection function is intact, promptly identify potential problems and repair them, thereby greatly improving the safety and reliability of electrical equipment.

[0048] Furthermore, the test circuit of this residual current operated circuit breaker has two break points, with the first and second break points controlled by button 1 and operating mechanism 200, respectively. This design offers extremely high reliability. There is a possibility that a user pressing button 1 for an extended period could cause resistor 4 in the test circuit to remain energized for a prolonged time, potentially leading to its burnout. This design effectively avoids this problem. Since the test circuit's conduction requires both button 1 to be pressed and operating mechanism 200 to be in the closed state, even if button 1 is pressed for a long time, as long as operating mechanism 200 is not in the closed state, the test circuit remains open, and resistor 4 will not be energized. This significantly reduces the risk of resistor 4 burning out, improves the stability and service life of the test device, and provides strong protection for the long-term safe operation of electrical equipment. Moreover, when the residual current is too high, the circuit breaker will trip, and operating mechanism 200 will switch to the open state, thus disconnecting the test circuit and protecting resistor 4 from damage.

[0049] Furthermore, such as Figure 1 Combination Figure 6As shown, the operating mechanism 200 has a first positioning post 2021 on the side wall of its housing 202, and the first helical portion 23 of the first torsion spring 2 is sleeved on the first positioning post 2021; and / or the operating mechanism 200 has a second positioning post 2022 on the side wall of its housing 202, and the second helical portion 33 of the second torsion spring 3 is sleeved on the second positioning post 2022. This design, which involves setting the first positioning post 2021 and the second positioning post 2022 on the side wall of the operating mechanism 200's housing 202, and sleeves the first helical portion 23 of the first torsion spring 2 and the second helical portion 33 of the second torsion spring 3 on the first positioning post 2021 and the second positioning post 2022 respectively, can be used individually according to actual needs, i.e., only the first positioning post 2021 or only the second positioning post 2022; or both can be used simultaneously to fully utilize the functions of the first torsion spring 2 and the second torsion spring 3 in the circuit breaker. During the operation of the residual current operated circuit breaker, the first torsion spring 2 and the second torsion spring 3 need to deform and reset in a predetermined manner to achieve the on / off control of the test circuit and the normal operation of the operating mechanism 200. By setting the first positioning post 2021 and the second positioning post 2022 on the side wall of the housing 202 of the operating mechanism 200, and respectively fitting the first helical part 23 of the first torsion spring 2 and the second helical part 33 of the second torsion spring 3 onto them, a precise positioning reference can be provided for the torsion spring. This allows the torsion spring to always move regularly around the positioning post when it is deformed by external force, avoiding problems such as torsion spring offset and jamming caused by inaccurate positioning. For example, when the button 1 is pressed to make the second end 22 of the first torsion spring 2 contact the third end 31 of the second torsion spring 3, the first torsion spring 2 can rotate stably around the first positioning post 2021, ensuring that the second end 22 can accurately abut against the third end 31, thereby ensuring reliable conduction of the first break point of the test circuit. Similarly, when the operating mechanism 200 is in the closed state, and the rocker arm 201 drives the fourth end 32 of the second torsion spring 3 to contact the first pin 41 of the resistor 4, the second torsion spring 3, supported by the second positioning post 2022, can accurately complete the action, ensuring the continuity of the second break point of the test circuit. This precise positioning design greatly improves the reliability of the circuit breaker operation, reduces faults caused by torsion spring position deviation, ensures that the circuit breaker can work normally at critical moments, cut off the circuit in time, and protect the safety of electrical equipment and personnel. During the operation of the circuit breaker, the operating mechanism 200 will frequently perform closing and opening actions, which will inevitably generate a certain amount of vibration and noise. As important elastic elements, the stability of the first torsion spring 2 and the second torsion spring 3 directly affects the smooth operation of the entire residual current operated circuit breaker. By fitting the first helical part 23 of the first torsion spring 2 and the second helical part 33 of the second torsion spring 3 onto the first positioning post 2021 and the second positioning post 2022 respectively, the positioning post can effectively support and constrain the torsion spring, reducing the vibration amplitude of the torsion spring during operation.When the operating mechanism 200 is activated, the torsion spring, restrained by the positioning post, will not experience significant swaying or swinging, thus reducing noise caused by torsion spring vibration. The installation of the operating mechanism 200 is a crucial step in the production of residual current operated circuit breakers. The design of installing positioning posts and torsion springs on the side wall of the operating mechanism 200 housing 202 simplifies and expedites the installation process. Installers simply align the first helical portion 23 of the first torsion spring 2 and the second helical portion 33 of the second torsion spring 3 with the first positioning post 2021 and the second positioning post 2022 respectively, and gently slide them in to complete the installation, eliminating the need for complex adjustments and calibrations. This significantly shortens installation time, improves production efficiency, reduces installation errors caused by human factors, and ensures consistent product quality. During circuit breaker maintenance, when the torsion spring needs replacement, operators can easily remove the old torsion spring from the positioning post and install the new one, without requiring extensive disassembly and adjustment of the entire operating mechanism 200, reducing maintenance costs and workload. In compact electrical devices like residual current circuit breakers, space utilization is a crucial design consideration. By using positioning posts on the side wall of the operating mechanism 200 housing 202 to fix the torsion spring, the space on the side wall of the operating mechanism 200 housing 202 is fully utilized, avoiding the need for additional complex fixing structures. This design makes the overall structure of the residual current circuit breaker more compact, achieving stable installation and reliable operation of the torsion spring within a limited space. Simultaneously, the compact structural design also helps reduce the size and weight of the circuit breaker, improving its installation flexibility and convenience, and adapting to installation requirements in different situations. For example, in some space-constrained distribution boxes, compact residual current circuit breakers can be installed and arranged more easily, improving the overall layout rationality of the electrical system.

[0050] Furthermore, such as Figure 2 , Figure 4 and Figure 7 As shown, the first end 21 is provided with a first bent overlapping section 211, and the first terminal block 6 is provided with a first locking groove 61, which engages with the first bent overlapping section 211. The first locking groove 61, on the first terminal block 6, has a shape, size, and depth that are adapted to the first bent overlapping section 211. The edges of the first locking groove 61 are smoothed to prevent damage to the first bent overlapping section 211 during the engagement process. During assembly, the first bent overlapping section 211 of the first end 21 of the first torsion spring 2 is accurately inserted into the first locking groove 61 of the first terminal block 6, and a stable engagement is achieved through the interaction force between the two. This engagement method is not only simple and easy to implement, but also ensures good electrical connectivity and mechanical stability between the first torsion spring 2 and the first terminal block 6 after connection.

[0051] Furthermore, such as Figure 2 and Figure 4 As shown, the lower end of button 1 is provided with several second slots 11, and the second end 22 engages with one of the second slots 11. The shape of the second slot 11 is adapted to the shape of the second end 22 of the first torsion spring 2. Through the complementary shape and interaction force between the second end 22 and the second slot 11, a stable and reliable connection is achieved, ensuring that the first torsion spring 2 can work in conjunction with button 1 to accurately complete the predetermined action during the operation of the circuit breaker. Optionally, the groove depths of the several second slots 11 are different, and different second slots 11 correspond to different operating forces. The operator can select to engage the second end 22 of the first torsion spring 2 with the appropriate second slot 11 according to the actual usage scenario and needs. For example, when the second end 22 is connected to the second slot 11 with a larger groove depth (reducing the upward angle of the second end 22), the initial pressing force of button 1 is larger; when the second end 22 is connected to the second slot 11 with a smaller groove depth (increasing the upward angle of the second end 22), the initial pressing force of button 1 is smaller.

[0052] Furthermore, such as Figure 4 Combination Figure 5 As shown, the second end 22 is provided with a second bent overlapping section 221, and the third end 31 is provided with a third bent overlapping section 311. Pressing button 1 can cause the second bent overlapping section 221 to abut against the third bent overlapping section 311. Under the normal state of the circuit breaker, the second bent overlapping section 221 and the third bent overlapping section 311 maintain a certain gap and are in a non-contact state. When the operator presses button 1, button 1 will transmit the operating force to the second end 22 of the first torsion spring 2. As button 1 is pressed down, the first torsion spring 2 undergoes elastic deformation, and the second bent overlapping section 221 gradually moves closer to the third bent overlapping section 311 under the action of force. When button 1 is pressed to a certain extent, the second bent overlapping section 221 and the third bent overlapping section 311 accurately abut against each other. At this time, the contact surfaces between the two are tightly fitted, forming a stable electrical or mechanical connection channel, realizing the connection of the first break point on the test circuit.

[0053] Furthermore, such as Figure 2 , Figure 5 and Figure 6As shown, the lower end of the rocker arm 201 is provided with a third slot 2011, and the fourth end 32 of the second torsion spring 3 engages with the third slot 2011; and / or the fourth end 32 is provided with a fourth bent overlapping section 321. When the operating mechanism 200 is in the closed state, the rocker arm 201 can drive the fourth bent overlapping section 321 to abut against the first pin 41. The depth and width of the third slot 2011 are adapted to the fourth end 32 of the second torsion spring 3, which can ensure that the fourth end 32 can be easily and accurately engaged, and can also provide sufficient restraint after engagement to prevent loosening or falling off during the operation of the circuit breaker. Through the complementary shape and interaction force between the fourth end 32 and the third slot 2011, a stable mechanical connection structure is formed. When the operating mechanism 200 is in the closed state, the rocker arm 201 will rotate, thereby driving the fourth bent overlapping section 321 to move towards the first pin 41. As the rocker arm 201 rotates, the fourth bent overlapping section 321 gradually approaches the first pin 41 and accurately abuts against the first pin 41 when it reaches a certain position. At this time, a stable electrical or mechanical connection channel is formed between the fourth bent overlapping section 321 and the first pin 41, ensuring that the second break point of the test circuit can conduct normally when the circuit is closed.

[0054] Furthermore, such as Figure 1 As shown, the mounting housing 100 includes a housing cover 101 and a housing base 102 that interlock. The housing cover 101 and housing base 102 form a receiving cavity, in which the operating mechanism 200 and the testing device are located. The housing base 102 serves as the foundation of the mounting housing 100. Both the housing base 102 and the housing cover 101 can be injection molded from high-strength engineering plastics with excellent insulation properties. The edges of the housing base 102 are finely ground to ensure tightness and flatness when interlocked with the housing cover 101. Inside the housing base 102, specialized mounting grooves and positioning structures are provided according to the shape and size of the operating mechanism 200 and the testing device. These mounting grooves and positioning structures can accurately fix the position of each component, preventing displacement or loosening of components during transportation and use. To facilitate user operation of the circuit breaker, a through hole 1011 is provided on the housing cover 101. The position of the through hole 1011 corresponds to the position of the button 1, which is located within the through hole 1011. Button 1 has a specially treated surface that provides a good tactile feel and anti-slip properties, making it easy for users to press and operate.

[0055] Furthermore, such as Figure 3 As shown, the lower end of button 1 is provided with a barb 12, which stops against the bottom wall of the housing cover 101. The lower end of button 1 is pushed up by the second end 22 of the first torsion spring 2, so that the upper end of button 1 protrudes from the housing cover 101. By adding the barb 12, button 1 is prevented from falling off the housing cover 101 through the through hole 1011.

[0056] Furthermore, such as Figure 1 Combination Figure 8 As shown, the housing base 102 is provided with at least two first mounting slots 1021, and the first terminal block 6 and the second terminal block 7 are respectively installed in the two first mounting slots 1021. The edges of the first mounting slots 1021 are smoothed to avoid damage to the terminal blocks from sharp corners. The at least two first mounting slots 1021 provided on the housing base 102 provide precise positioning and fixing functions for the first terminal block 6 and the second terminal block 7. During installation, the terminal blocks can be smoothly installed into the designated positions of the mounting slots, making the connection between the terminal blocks and the housing base 102 more secure and reliable, effectively preventing the terminal blocks from loosening or shifting due to vibration, collision, or other factors. During the long-term operation of the circuit breaker, even if affected by the external environment, the terminal blocks can always remain in the correct position, ensuring the stability of the electrical connection.

[0057] Furthermore, the housing base 102 is provided with a second assembly groove 1022 and a pin slot 1023. The resistor 4 is inserted into the second assembly groove 1022, and the first pin 41 of the resistor 4 is engaged with the pin slot 1023. The second assembly groove 1022 is adapted to the external dimensions of the resistor 4 to ensure that the resistor 4 can be securely inserted into the second assembly groove 1022. The surface of the groove wall of the second assembly groove 1022 is smoothed to reduce the friction between it and the resistor 4, facilitating the installation and removal of the resistor 4. At the same time, an elastic pad or a positioning protrusion may also be provided at the bottom of the second assembly groove 1022. When the resistor 4 is inserted, the elastic pad can act as a buffer to prevent the resistor 4 from being damaged by excessive impact force; the positioning protrusion can help the resistor 4 to be positioned quickly and accurately, ensuring the accuracy of the installation position. The pin slot 1023 matches the first pin 41 of the resistor 4. The pin slot 1023 is typically semi-circular or V-shaped, which allows for better contact with the pin, providing a larger contact area and enhancing the stability of the connection. The edges of the pin slot 1023 are chamfered to prevent sharp corners from damaging the first pin 41. Inside the pin slot 1023, there may also be tiny protrusions or textures; these structures increase friction with the pin, preventing the pin from loosening or falling out within the slot.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. Residual current circuit breaker comprising a mounting housing (100) provided with a first terminal block (6) and a second terminal block (7), an operating mechanism (200) and a zero sequence transformer (300), which are arranged in the mounting housing (100), characterized in that It also includes a button (1) disposed on the mounting housing (100) and a testing device disposed within the mounting housing (100), the testing device comprising: The first torsion spring (2) has a first end (21) and a second end (22), the first end (21) abutting against the first terminal block (6), and the second end (22) abutting against the button (1); The second torsion spring (3) has a third end (31) and a fourth end (32), the fourth end (32) abutting against the rocker arm (201) of the operating mechanism (200), and pressing the button (1) can drive the second end (22) to abut against the third end (31); The resistor (4) has a first pin (41) and a second pin (42). When the operating mechanism (200) is in the closed state, the rocker arm (201) can drive the fourth end (32) to abut against the first pin (41). A wire (5) is provided, one end of which is connected to the second pin (42), and the other end of which passes through the zero-sequence transformer (300) and is connected to the second terminal block (7).

2. The residual current operated circuit breaker according to claim 1, characterized in that, The operating mechanism (200) has a first positioning post (2021) on the side wall of its outer casing (202), and the first helical part (23) of the first torsion spring (2) is sleeved on the first positioning post (2021); and / or The operating mechanism (200) has a second positioning post (2022) on the side wall of the outer shell (202), and the second helical part (33) of the second torsion spring (3) is sleeved on the second positioning post (2022).

3. The residual current operated circuit breaker according to claim 1, characterized in that, The first end (21) is provided with a first bent overlapping section (211), and the first terminal block (6) is provided with a first slot (61), and the first bent overlapping section (211) is engaged with the first slot (61).

4. The residual current circuit breaker according to claim 1, characterized in that, The lower end of the button (1) is provided with a plurality of second slots (11), and the second end (22) engages with one of the second slots (11).

5. The residual current circuit breaker according to claim 1, characterized in that, The second end (22) is provided with a second bent overlap section (221), and the third end (31) is provided with a third bent overlap section (311). Pressing the button (1) can cause the second bent overlap section (221) to abut against the third bent overlap section (311).

6. The residual current circuit breaker according to claim 1, characterized in that, The lower end of the rocker arm (201) is provided with a third slot (2011), and the fourth end (32) is engaged with the third slot (2011); and / or The fourth end (32) is provided with a fourth bent overlapping section (321). When the operating mechanism (200) is in the closed state, the rocker arm (201) can drive the fourth bent overlapping section (321) to abut against the first pin (41).

7. The residual current operated circuit breaker according to any one of claims 1-6, characterized in that, The mounting housing (100) includes a housing cover (101) and a housing base (102) that interlock with each other. The housing cover (101) and the housing base (102) form a receiving cavity. The operating mechanism (200) and the test device are both located in the receiving cavity. The housing cover (101) is provided with a through hole (1011), and the button (1) is disposed in the through hole (1011).

8. The residual current operated circuit breaker according to claim 7, characterized in that, The button (1) has a barb (12) at its lower end, and the barb (12) stops against the bottom wall of the housing cover (101).

9. The residual current operated circuit breaker according to claim 7, characterized in that, The housing base (102) is provided with at least two first assembly slots (1021), and the first terminal block (6) and the second terminal block (7) are respectively installed in the two first assembly slots (1021).

10. The residual current operated circuit breaker according to claim 7, characterized in that, The housing base (102) is provided with a second assembly groove (1022) and a pin slot (1023). The resistor (4) is inserted into the second assembly groove (1022), and the first pin (41) of the resistor (4) is engaged with the pin slot (1023).

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